If your brush head does not move, please consider two solutions.
1. Please reinstall the brush head as it is shown in your toothbrush user’s manual.

2. Please charge your Philips Sonicare toothbrush for 24 hours.
In case this problem persists please refer to the warranty chapter on your toothbrush user’s manual. Users Manuals are available on the web in the Support page under your products HX model number. Click here for Support page.